To solve the question regarding the set of critical elements required for plant growth, we will follow these steps:
### Step 1: Understand the Critical Elements for Plant Growth
Plants require various nutrients to grow, which they obtain from the soil. The essential nutrients are often categorized into macronutrients and micronutrients. The critical elements for plant growth include:
- Nitrogen (N)
- Phosphorus (P)
- Potassium (K)
- Calcium (Ca)
- Magnesium (Mg)
- Sulfur (S)
### Step 2: Analyze the Given Options
We need to evaluate each option provided in the question to determine which sets of elements are critical for plant growth.
1. **Option 1: Sodium, Potassium, Calcium**
- Sodium is not considered a critical element for plant growth, while potassium and calcium are. Therefore, this option is incorrect.
2. **Option 2: Nitrogen, Phosphorus, Magnesium**
- All three elements (nitrogen, phosphorus, and magnesium) are essential for plant growth. Therefore, this option is correct.
3. **Option 3: Nitrogen, Phosphorus, Potassium**
- All three elements (nitrogen, phosphorus, and potassium) are also essential for plant growth. Therefore, this option is correct.
4. **Option 4: Manganese, Boron, Molybdenum**
- While manganese, boron, and molybdenum are important micronutrients, they are not classified as critical elements in the same way as the macronutrients listed above. Therefore, this option is incorrect.
### Step 3: Conclusion
Based on the analysis:
- **Correct Options**: Option 2 (Nitrogen, Phosphorus, Magnesium) and Option 3 (Nitrogen, Phosphorus, Potassium) are both correct.
- **Incorrect Options**: Option 1 and Option 4 are incorrect.
### Final Answer
The set of critical elements required for plant growth includes:
- Option 2: Nitrogen, Phosphorus, Magnesium
- Option 3: Nitrogen, Phosphorus, Potassium
